Model

Claude Sonnet 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYY9W05KV2NHGK9665S8ZPM

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The mansion stood eerily silent. Rain hammered the tall windows. Detective Sarah Chen arrived precisely. Her coat dripped onto marble. The butler's hands were trembling. "Lord Pemberton is quite dead," he whispered into the darkness. Sarah climbed the winding staircase. Portraits watched her ascend slowly. The bedroom door hung open. Lord Pemberton lay facing upward. His eyes stared at nothing. A silver knife protruded wickedly. Blood had pooled beneath him. The window remained locked tight. No signs of forced entry. "Who discovered the body here?" Sarah asked the pale butler. "The maid, at six o'clock." Sarah examined the crime scene. Something felt terribly wrong here. The knife looked far too ornate. This was no random murder. Someone in this house knew. Someone was hiding dark secrets. Thunder crashed outside the window. The investigation had officially begun.
created_at"2026-02-08T15:35:45.793373+00:00" Sunday, February 8th, 2026 at 3:35:45 PM GMT+00:00
model"anthropic/claude-4.5-sonnet-20250929" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1572
moderation_latency184
generation_time5195
tokens_prompt35
tokens_completion180
native_tokens_prompt44
native_tokens_completion205
native_tokens_completion_images(null)
native_tokens_reasoning0
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/" 
is_byokfalse
finish_reason"stop" 
native_finish_reason"stop" 
usage0.003207
router(null)
provider_responses
0
id"a8538fe4-79da-43d1-86fe-5afa1ed51ad7" 
status200
is_byokfalse
latency1571
endpoint_id"d8bee848-f020-454a-b2be-4a7ce868f99f" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-sonnet-20250929" 
api_type"completions" 
id"gen-1770564939-PtuD6kLxGfVZvXJOC0tw" 
upstream_id"a8538fe4-79da-43d1-86fe-5afa1ed51ad7" 
total_cost0.003207
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
91.1152% Matches word count n/a
neededCleanfalse
sentences25
wordCounts
05
15
25
35
45
510
65
75
85
95
105
115
125
135
145
1510
165
175
185
196
205
215
225
235
245